The tetraphenylboron sodium gravimetric method must be employed when K2O is higher in compound fertilizer for enough accuracy.

当混肥中K2O含量较高时,仍宜用四苯钾重量法测定钾含量。

METHODS Sodium tetraphenylboron gravimetric analysis was replaced by highly-accurate nephelometric titrimetry to determine potassium chloride in Compound sodium chloride injection.

方法用高射光滴定法代替四苯钠重量法。